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A schema with all deprecated elements removed must itself be valid #1231

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4 changes: 3 additions & 1 deletion spec/Section 3 -- Type System.md
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Expand Up @@ -136,6 +136,9 @@ All types and directives defined within a schema must not have a name which
begins with {"\_\_"} (two underscores), as this is used exclusively by GraphQL's
introspection system.

If a GraphQL schema contains any deprecated _schema element_, a copy of the
schema that omits all deprecated _schema element_ must itself be valid.

### Root Operation Types

:: A schema defines the initial _root operation type_ for each kind of operation
Expand Down Expand Up @@ -968,7 +971,6 @@ IsValidImplementation(type, implementedType):
2. Let {implementedFieldType} be the return type of {implementedField}.
3. {IsValidImplementationFieldType(fieldType, implementedFieldType)} must
be {true}.
6. If {field} is deprecated then {implementedField} must also be deprecated.

IsValidImplementationFieldType(fieldType, implementedFieldType):

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